The Admiralty mercator chart - The Basics

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For a map to be useful in helping to navigate and plan a voyage (us sailors call them charts) it must be properly understood and be accurate for its purpose.  Charts are physical (or electronic) representations of the physical characteristics of the earth & the water on it. They are a projection of a curved surface (the earth) onto a flat one (such as a sheet of paper or computer screen).

It's necessary to make some adjustments to how this information is presented so that this projection can be done whilst still making it a useful and navigationally accurate representation of the surface of this spherical planet.
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